--- service: a.root-servers.net start-period: '2015-02-19T00:00:00Z' end-period: '2015-02-19T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2952674733 dns-udp-queries-received-ipv6: 227407168 dns-tcp-queries-received-ipv4: 16724797 dns-tcp-queries-received-ipv6: 1961796 dns-udp-responses-sent-ipv4: 2945190271 dns-udp-responses-sent-ipv6: 226979856 dns-tcp-responses-sent-ipv4: 14394820 dns-tcp-responses-sent-ipv6: 1200588